All Embraer EMB-505 airplanes must now replace a critical bolt, with an optional permanent fix

The US aviation regulator is expanding a mandatory repair for a specific type of Embraer airplane. All EMB-505 airplanes must now replace a clutch retaining bolt and washer in the aileron autopilot servo mount, with a permanent fix now available.

A small part in an airplane's autopilot system can fail, which means the plane's ailerons could stop working. This rule means every plane of this type must get the fix, and it offers a way to stop having to replace the part repeatedly. This shifts the cost of a known defect from potential accident liability to a mandatory maintenance expense for operators.